Schedule II - Condensed Financial Information of Registrant - Balance Sheet (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Total investments	$ 33,856	$ 27,293
Cash	917	855	$ 859
Investment in operating affiliates	1,119	965
Other assets	4,761	2,919
Total assets	58,906	47,990	45,101
Liabilities
Senior notes	2,726	2,725
Other liabilities	1,942	1,367
Total liabilities	40,551	35,069	31,546
Shareholders’ Equity
Non-cumulative preferred shares	830	830
Common shares ($0.0011 par, shares issued: 591.9 and 588.3)	1	1
Additional paid-in capital	2,327	2,211
Retained earnings	20,295	15,892
Accumulated other comprehensive income (loss), net of deferred income tax	(676)	(1,646)	(65)	$ 489
Common shares held in treasury, at cost (shares: 218.5 and 217.9)	(4,424)	(4,378)
Total shareholders' equity	18,353	12,910	$ 13,546
Total liabilities and shareholders' equity	$ 58,906	$ 47,990
Parenthetical information:
Common shares, par value per share	$ 0.0011	$ 0.0011
Common shares issued (shares)	591.9	588.3	583.3	579.0
Common shares held in treasury (shares)	218.5	217.9	204.4
Parent Company
Assets
Total investments	$ 17	$ 7
Cash	9	11
Investment in subsidiaries	19,590	14,191
Investment in operating affiliates	4	5
Due from Affiliates	0	2
Other assets	58	18
Total assets	19,678	14,234
Liabilities
Senior notes	1,287	1,287
Other liabilities	38	37
Total liabilities	1,325	1,324
Shareholders’ Equity
Non-cumulative preferred shares	830	830
Common shares ($0.0011 par, shares issued: 591.9 and 588.3)	1	1
Additional paid-in capital	2,327	2,211
Retained earnings	20,295	15,892
Accumulated other comprehensive income (loss), net of deferred income tax	(676)	(1,646)
Common shares held in treasury, at cost (shares: 218.5 and 217.9)	(4,424)	(4,378)
Total shareholders' equity	18,353	12,910
Total liabilities and shareholders' equity	$ 19,678	$ 14,234
Parenthetical information:
Common shares, par value per share	$ 0.0011	$ 0.0011
Common shares issued (shares)	591.9	588.3
Common shares held in treasury (shares)	218.5	217.9